Tube DIY Asylum

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RE: Other Methods IT

Posted by cpotl on March 5, 2017 at 09:42:22:
"You said "Current into the Miller capacitance" but then you said "No power is delivered to the load"

If the driver stage has to deliver current to the Miller capacitance then isn't the Miller capacitance a load for the driver tube?

Maybe I'm not understanding what you mean by "the load" or maybe I don't understand what you mean by "consume power"."

Perhaps he was making the point that no power is delivered into a purely capacitive load, since the voltage and the current are 90 degrees out of phase. In your example of 70v times 3.5ma of current, if that were into a resistive load it would indeed represent a power dissipation of 0.245W, but if the load is pure capacitive, the power dissipated into it would be zero.

Whether that is a relevant issue as far as demands on the driver is concerned is another question.

Chris